Isoelectronic study of triply excited Li-like states

E.P. Benis¹, T.J.M. Zouros², T.W. Gorczycaz³, M. Zamkov¹, P. Richard¹

¹James R. Macdonald Laboratory, Department of Physics, Kansas State University, Manhattan, KS 66506-2604, USA

²Department of Physics, University of Crete, P.O. Box 2208, 71003 Heraklion, Crete, Greece & Institute of Electronic Structure and Laser, P.O. Box 1527, 71110, Heraklion, Crete, Greece

³Department of Physics, Western Michigan University, Kalamazoo, Michigan 49008, USA

Absolute doubly differential cross sections for the production and Auger decay of the 2s2p^{2 2}D triply excited state formed in collisions of He-like B³⁺, C⁴⁺, N⁵⁺, O⁶⁺ and F⁷⁺ ions with H₂ were measured using zero-degree Auger projectile electron spectroscopy. The ²D^e state was directly produced by the resonant scattering of the quasi-free H₂ electrons from the 1s2s ³S metastable state of the ions. Auger decay rates back to the 1s2s ³S state (elastic channel), and 1s2s ¹S and 1s2p ³P states (inelastic channels) were also determined as a function of Z. R-matrix calculations, performed within the electron scattering model, were found to be in good to excellent overall agreement.

This work was supported by the Chemical Sciences, Geosciences and Biosciences Division,
Office of Basic Energy Sciences, Office of Science, U.S. Department of Energy.

TWG supported in part by NASA Space Astrophysics Research and Analysis Program Grant NAG5-10445.

Submitted to ISIAC 2003, July 2003 in Stockholm, Sweden.

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